Hymenophyllum pallidum (Blume) Ebihara & K.Iwats.

Family

Hymenophyllaceae

Nomenclature

Hymenophyllum pallidum (Blume) Ebihara & K.Iwats., Blumea 51(2): 232. 2006. – Trichomanes pallidum Blume, Enum. Pl. Javae: 225. 1828; Bedd., Handb. Ferns Brit. India: 41. 1883; Copel., Philipp. J. Sci. 51: 141 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 67. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 97. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 17.1961. – Pleuromanes pallidum (Blume) C.Presl, Epimel. Bot.: 258. 1851 [‘1849’]; Copel., Philipp. J. Sci. 67: 56. 1938; Ching, Fl. Reipubl. Popularis Sin. 2: 172, pl. 14, f. 5–8. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 41. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 52. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 86. 1979. – Crepidomanes pallidum (Blume) K.Iwats., Acta Phytotax. Geobot. 35: 174. 1984; Tagawa & K.Iwats., Fl. Thailand 3: 613. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 71. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 27. 2007.

Description

Rhizome wiry, about 0.3 mm diam., covered with light brownish hairs. Stipes dark stramineous, hairy at the base, 1.5–4 cm long, without wings. Laminae bipinnate to subtripinnatifid, oblong to somewhat irregular in outline, about 5 cm long, 1.5 cm wide, somewhat variable in size; pinnae oblong to oblong-lanceolate, round to acute at apex, cuneate at sessile base; ultimate segments linear-lanceolate, acute at apex, entire and flat at margin; undersurface of laminar part covered with powder, glaucous in appearance, densely covered with stellate or filiform hairs; marginal cells extremely modified. Sori terminal on short acroscopic axial lobes; involucre cup-shaped to tubular, subdeltoid, about 1.5 mm long, the lips slightly dilated.

Distribution in Thailand

NORTH-EASTERN: Loei; PENINSULAR: Surat Thani, Krabi, Nakhon Si Thammarat, Trang, Yala.

Distribution in Laos

Unspecified.

Wider Distribution

From Sri Lanka to Polynesia, north to Taiwan.

Ecology

Pendulous on moist muddy rocks in dense forest at medium altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any immediate known threat.

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